Question

Hello everyone (sorry for my english). I’m new with objetive-C and iOS programming. May you help me?

@interface RootViewController : UITableViewController 
{
    NSMutableArray *keysFromQuery;
}

@property (nonatomic, retain) NSMutableArray *keysFromQuery;
....
....
NSString *category = [keysFromQuery objectAtIndex:0];

What will happen with [keysFromQuery objectAtIndex:0] if I do: [category release];?

What will happen with category if I do after that: [keysFromQuery release];?

I don’t know well how references and memory mechanisms work.

Thanks!

Answer 1

Don’t call -release on category. You don’t own the object. You must only release objects which you have taken ownership of, via NARC (new/alloc/retain/copy). For more info read the Memory Management Programming Guide.